package fghds;

public class jj {

	public static void main(String[] args) {
		int i=1;
		int s=0;
		int a;
		while (i<=100) {
			if (i%2==0) {
				s=s+i;
				
			}
			i++;
			
		}
		System.out.println(s);
	}

}
